Depends whatyou choose 'political' to mean. I'd have said that to be anti-war was a moral rather than political position, and a position publically espoused by all politicians and human beings. Which political parties or theorists are 'pro-war'? They may choose to go to war, but they always blame the other side and claim they themselves are the peace-lovers.[Never the warlovers, nor even approving of war, which is always presented by all sides as a most regrettable evil, surely?.] You may choose to doubt their words, their honesty, their level of self-awareness. But no-one will say they are in favour of war, so how is being anti-war a political act?
Many people are of course evil and in other ways immoral in some of their actions - for example the way some people tolerate and justify war-making. But their political statements of belief and principle are always anti-war.